Airplane.



H. C. MUMMERT.

AIRPLANE.

APPLICATION HLED JAN. I8. 1918.

Patented Aug. 6, 1918.

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Evert far," Har 1 m oorrzmzff QMWW H. C. MUMMERT.

AIRPLANE. APPLICATION FILED JAN. 18. 1918.

2 SHEETS-SHEET 2.

I l a g g 1w 5 1% Wary- 5 C, mummzrt Patented Aug. 6, 1918.

STATES PATENT OFFICE.

HARVEY C. MUMMERT,.OFCBUFFALO, NEW YORK.

- AIRPLANE/ 7 To all whom z't may concern:

. thefollowing is a specification,

cured to a fixed part of the machine.

, This invention relates to improvements in airplanes, and more particularly to control mechanism, for airplanes;

The object of my inventionis to provide 2 means whereby, by the manipulation of a lever, the impact-angle of the movable parts of both planes, may be simultaneously and equally changed, and. thereby, by another lever acting through the same mechamsm, said movablev parts may be oppositelyand equally changed. These and other ob]ects will clearly. appear from the following spec1-. fications and claims and from the drawings in which,' v

Figure 1 isan outline plan view of an auplane provided with my improvements Fig. 2 is a detail plan view, partly in section, ofmy control mechanism.

Fig. 3 is a detail side elevation of the same;

The wings or planes 1 and 2 are rigidly secured to the body 3 in 1 any well known manner, and have the movable .portions 4 and 5 at the rear of said planes. The movable portions 4 and 5 arerigidly secured to extensions of the shafts 6 and 7. These shafts 6 and 7 are supported in borings 1n the bearing ends of the yoke 12 within bearings 8 and 9 secured to the follow boards of the body and passing through the sides of the body, as indicated at 10, and the extensions secured to the rigid portions of the planes by hinge-clips, one of which is shown at 11 in Fig. 2.

A yoke casting 12, having bearing extensions 12 which are within the bearings 8 and 9, has a handle at its forward end, and at the base of which handle is a slot which takes over a segmental rack 13 which is SK rack-latch 14 within the handle portion ofthe yoke 12 is adapted to engage this rack and to hold it in any desired position.

By releasing the latch 14 and moving the handle of the yoke 12, through the mechanism next described the movable portions 4 and 5 of the planes are given any desired degree of me matlon, thus producin the Specification of Letters Patent.

' movement of both elevators and Patented Aug. 6, 1918.

Application filed J'anuary18, 1918.. Serial No. 212,514.

gearmesh, respectively, with the segmental v I bevel-gears 17 and 18, which are secured respectively and 7. Pivoted over the shaft 15'is alever Y 19, which extendsup'wardly in front of the operator and projects downwardly below the shaft--15. This pivotal connection is such that'saidlever maybe moved forward or back without movement of theshaft15,

' while lateral movement of this lever in either direction rotates the shaft 15. Tothis lever are secured cables 20 and 21 which control the elevatorsorhorizontal rudders 22 and 23. This lever may thus be moved forward or back to control the said elevators without movement of the shaft 15;but transverse movement of said lever rotates said shaft and moves said movable planes oppositely; and both movements of said lever efl'ect plane members.

Thus movement of the yoke 12, through said gearing, changes the impact angle of the movable planes to increase or decrease the lifting power of both planes. Through transverse movement of the lever 19, the impact angle of one of said planes is made greater and the other less to increase the lift of the one and to decrease that of the other for the purpose of correcting any lateral tipping of the machine, or to control in banking and other movements; andby forward or back movement of said lever said elevators moved to control the forward and aft movement of the machine; and these lever control operations may be employed separately or simultaneously. These means,

to the inner ends of the'shafts 6 therefore, afford the several controls stated, a

and both plane controls are effected through a single main mechanism which combines the elements of simplicity, strength, and lightuses which are essential in airplane construction.

. Having thus described my invention, I

gearing b tween the r k shaft and the side 110 planes, a lever pivoted to the rock shaft with its axis at a right angle to the axis of to swing in a plane parallel to the axis the yoke, alever pivoted to the rock-shaft on 10 thereof, and connections between the lever an axis at a right angle to that of the shaft and the rudder plane. and adapted to rock said shaft, and connec- 5 2. In an airplane,'the combination with tions between the lever and. the rudder pivoted side planes and a rudder plane, of plane, to adjust the latter by movement of a yoke pivoted concentrically with the side the lever on its own axis.

planes,' a rook-shaft carried by the yoke HARVEY O. MUMMERT. 

